MIC2940A Datasheet, PDF (8/8 Pages) Micrel Semiconductor – 1.25A Low-Dropout Voltage Regulator Preliminary Information

MIC2940A/2941A
Typical Applications
V _IN
+VIN
VOUT
*VOUT ≈5V
V_OUT = 5V
GND
+
10µF
Micrel
+VIN
VIN
VOUT
VOUT
1.2V 26V
SHUTDOWN
INPUT
SHUTDOWN
OFF
GND ADJUST
ON
1.23V
R1 100
pF
22µF
VOUT = VREF x (1 +
R1
R2
)
VREF
R2
Figure 2. MIC2940A-5.0 Fixed +5V Regulator
Figure 3. MIC2941A Adjustable Regulator
+VIN
+5V to +7V
VIN
VOUT
VOUT ≈ VIN
GND ADJUST
SHUTDOWN
INPUT
OFF
+VIN
VOUT
SHUTDOWN
ON
GND ADJUST
VCC OUT
100pF
+
300kΩ ^10µF
1%
3.3V
5V
Input Output
0
3.3V
1
5.0V
470 kΩ
220kΩ 180kΩ
1%
1%
2N2222
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV TO 400mV,
DEPENDING ON LOAD CURRENT.
Figure 4. MIC2941A Wide Input Voltage Range Current Limiter
ADJUST PIN LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V.
Figure 5. MIC2941A 5.0V or 3.3V Selectable Regulator with
Shutdown.
MIC2940A/2941A
8
June 1999